On Tuesday evening, Rob Kardashian posted a NSFW message on Instagram referencing Blac Chyna, his main boo since January. It would appear that his Kardashian sisters do not approve of his companion, and that Rob would jokingly prefer to become an orphan rather than give up sex with Blac Chyna:

Rob has been an elusive member of the Kardashian clan, choosing not to appear in their reality TV show, and doing his best to keep a low profile away from the constant media attention. Few recent pictures of him exist, though he has become more active recently on social media. Blac Chyna recently posted this to Instagram:

Sources: People